EUVD-2025-25141

Comprehensive Technical Analysis of EUVD-2025-25141

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-25141 pertains to a namespace label injection flaw in Capsule, a multi-tenancy and policy-based framework for Kubernetes. This vulnerability allows authenticated tenant users to inject arbitrary labels into system namespaces, thereby bypassing multi-tenant isolation mechanisms. The severity of this vulnerability is rated with a CVSS Base Score of 9.1, indicating a critical risk. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): Low (L) - The attacker needs low-level privileges, such as those of a tenant user.
• User Interaction (UI): Required (R) - Some form of user interaction is necessary to exploit the vulnerability.
• Scope (S): Changed (C) - The vulnerability affects resources beyond the security scope managed by the security authority.
• Confidentiality (C): High (H) - The vulnerability results in a high impact on confidentiality.
• Integrity (I): High (H) - The vulnerability results in a high impact on integrity.
• Availability (A): High (H) - The vulnerability results in a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves authenticated tenant users injecting arbitrary labels into system namespaces. This can be achieved through:

• Label Injection: Tenant users can manipulate the labels of namespaces to include malicious or unauthorized labels.
• Cross-Tenant Access: By injecting labels, attackers can bypass isolation mechanisms and access resources belonging to other tenants.
• Privilege Escalation: The ability to inject labels can lead to elevated privileges, allowing attackers to perform actions that should be restricted.

3. Affected Systems and Software Versions

The vulnerability affects Capsule versions v0.10.3 and earlier. The issue has been resolved in version 0.10.4. Organizations using Capsule for multi-tenancy in Kubernetes environments should prioritize updating to the patched version.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Immediate Patching: Upgrade to Capsule version 0.10.4 or later, which includes the fix for this vulnerability.
• Access Controls: Implement strict access controls and monitor tenant activities closely.
• Namespace Isolation: Enforce robust namespace isolation policies and regularly audit namespace configurations.
• Monitoring and Logging: Enhance monitoring and logging to detect any suspicious activities related to namespace label changes.
• User Education: Educate users about the risks of label injection and the importance of adhering to security policies.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations within the European Union that rely on Capsule for Kubernetes multi-tenancy. The potential for cross-tenant access and privilege escalation could lead to data breaches, unauthorized access, and service disruptions. Given the critical nature of the vulnerability, it is essential for organizations to address it promptly to maintain compliance with regulations such as GDPR and to protect sensitive data.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Identification: The vulnerability is identified as CVE-2025-55205 and is documented in the EUVD as EUVD-2025-25141.
• References:
  • GitHub Security Advisory: GHSA-fcpm-6mxq-m5vv
  • Fix Commit: e1f47feade6e1695b2204407607d07c3b3994f6e
• ENISA IDs:
  • Product: 4964f303-3aaa-3ef2-a88f-359606bb35ba
  • Vendor: f4dd419b-5eaf-36c6-ace1-1b0fddc8a6b8

Security professionals should review the provided references for detailed information on the vulnerability and the patch. Regular security audits and penetration testing should be conducted to ensure that similar vulnerabilities are identified and addressed proactively.

Conclusion

The namespace label injection vulnerability in Capsule v0.10.3 and earlier is a critical issue that requires immediate attention. Organizations should prioritize updating to the patched version and implement robust security measures to mitigate the risk. The potential impact on the European cybersecurity landscape underscores the importance of vigilant monitoring and proactive security management.